due to faa staffing issues, workforce reductions, that started sunday night. erin was on a flight sunday night from las vegas to l.a. little did she know, forced spending cuts began the same day, reducing the number of air traffic controllers on duty. the result? major flight delays. >> on an 8:25, and when i rebooked, our departure time, 1:45 a.m. a couple airline employees said it was due to fog, and a couple says it was due to sequestration. >> reporter: actually it was both according to air traffic union rep, who was working sunday night. there are four parallel runways that can operate simultaneously on clear days. >> when the weather comes in, we go to a in, we go to a two runway rate. >> that requires one air traffic controller monitoring each arriving plane. the lax air traffic control tower is operating on delaying. >> reporter: it doesn't create much to create a big backlog. 400 flights were delayed because of staffing shortages sunday night. >> these are awful and they must stop. we cannot let these delays go through. not because of convenience, but